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Mass number

A total count of the neutrons and protons

Chemical symbol

A capital letter or a combination of a capital letter and a small letter that is used to represent an element

Periodic table

A chart that shows the classification of elements

Average atomic mass

An average of the masses of all the isotopes that occur in nature for an element

Isotopes

Atoms of the same element but with different numbers of neutrons

Transition metals

Elements in the middle of the periodic table, groups 4 through 7

Metals

Elements that are found on the left side of the periodic table

Metalloids

Elements that have some properties of both metals and nonmetals

Nucleus

The center of an atom where protons and neutrons are located

Period

The horizontal rows of elements

Atomic mass

The number of protons in an atom

Electrons

The particles that move about about the nucleus and have a negative charge

Electron cloud

The region around the nucleus occupied by electrons

Groups

Vertical columns of elements


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